上海托福留学课程辅导学校

官方真题Official模考软件是目前市面上唯一一款免费的托福备考工具，目前已更新到49套题（下载：官方真题Official1-49免费下载）。为了让大家更好的使用官方真题Official模考软件，这里编辑为大家整理了完整的官方真题Official真题题目、文本以及答案解析，希望对大家的托福备考有帮助。

Lecture 1音频mp3免费下载地址>>>http://bbs.*/thread-357935-1-1.html

官方真题Official 35-L1

Narrator:

Listen to part of a lecture in an animal behavior class.

Professor:

Before we leave the topic of animal navigation, let's look at one more species and how it finds its way through its environment.

The species we'll look at is the blind mole rat.

Blind mole rats are interesting in terms of navigation because they live entirely in the dark-In elaborate underground tunnel systems. So how do blind mole rats find their way around in these complicated tunnels?

Well, for some time we've known that blind mole rats use some combination of two different navigation systems.

Um, one system relies on their sense of time and their ability to remember underground landmarks. For example, let's say a mole rat wants to find its way through its tunnel system back to its nest where it sleeps. Well, it goes along. Then it feels some hard stones or a tree root under its feet and it basically says to itself. "Ok, here is where I took a left." And then it might remember how long it took to get to the next turn and so forth. The mole rat goes straight or turns based on what it remembers having sensed along the way on previous trips and the time it took between turns.

Now, the other navigation system for the mole rat relies on Earth's magnetic field. Mole rats have the ability to sense the magnetic field and use it to orient themselves directionally. But until recently scientists weren't sure about the role of these two different systems.

Recently a team of researchers conducted an experiment to answer that question. Do these two navigation systems play different roles? What they did was they designed a special structure that very closely resembles a blind mole rat's tunnel system, which looks like a bicycle wheel, a central hub with multiple spokes radiating outward.

Now this turned out to be quite important. Earlier experiments have used a more generic habitat, basically a wide open circle, which was originally designed to test magnetic navigation in other animals. That design led to inconclusive results with mole rats.

Now, with their bicycle wheel tunnel system the researchers were able to vary the distance that the mole rats travel between their nest and their food source by creating long routes and short routes. In each trial, the mole rats started out in their nest, went to the food source and then had to find their way back home, back to the nest.

To determine which navigation system they were using, the researchers tested the animals under two different conditions.

First, the mole rats were tested under conditions of normal magnetism for both the trip to the food and the trip home. And under these normal conditions, they all followed their original route back home, regardless of the length of the trip to the food source.

Then in the second part of the experiment, the magnetic field was altered but only for the trip home, a specially constructed set of magnets was used to shift the magnetic field around the habitat 19 degrees eastward. The researchers wanted to see how the mole rats responded to this shift. Well, it turns out that the magnetic shift had no impact on the return route of the blind mole rats after a short trip. They returned to the point where they had started from.

But after a longer trip, they took a totally different route: one that led them nine degrees east of the nest. Essentially they got lost. This was strong evidence that blind mole rats use magnetic navigation only for longer trips.

So why two navigation systems: one for long trips and one for short trips?

Well, for now we can only speculate, but we think that when mole rats rely on the first system, using underground landmarks or their sense of time, well, they make small mistakes here and there. On a short trip, this doesn't matter much. The trip is short, so they can't make many mistakes.

But on a long trip, well, there are lots of opportunities to make small mistakes, and small mistakes can add up, leading the mole rat far from where it wants to be. So on a long trip, a magnetic navigation system is better, more useful, since earth's magnetic field is stable, a constant, a more reliable indicator of direction!

希望这些官方真题Official真题音频文本对大家备考托福有帮助。最后，编辑预祝大家托福考试能取得理想的托福成绩。

如果和你说这是我第四次考托福，也许会让很多人吃惊。其实，现在回头看看，也觉得考试中只有攻克了自己的顽疾，才能顺利的战胜托福考试。下面就和大家分享一下，我是如何备考托福的吧。

说到自己托福顽疾的最大一点，就是阅读了。前三战阅读分别是17，21，22，很让人沮丧。反思了一下，我发现我做题的时候一直都忽略了细节，而一味的抓主干，找文章中心与大意。其实大家把官方真题Official 1-24都做一遍就会有一种强烈的感受：很多题目的答案都出自微小的细节。

另外一个难点问题，就是我的托福听力。虽然，很多备考的托友都会知道，听力的备考技巧性并不是那么强，就是平时不断的磨耳朵。但是，想要有提高，需要自己的耐力和正确的方向。同样，我觉得一个重要的问题还是要扩大专业词汇量。

口语方面我不是特别厉害，最好一次也仅仅24。我能提出的建议便是口语要勤练。口语的前两个task准备的时间是15秒，在短短的15秒我们通常不能非常好的想到3个有说服力的观点，后4个task主要考了考生总结概述的能力。

微微可以让我可以有所安慰的就是托福写作部分了。在*写作中质量比数量重要，能把自己的观点摆明，再用例子和argument证明好，就是一篇好作文。而综合写作中，阅读和听力中的重要信息一定要好好把握。